is a solid with a base and a , called the vertex
, that is not in the same as the base. The altitude
of a cone is the from the vertex to the plane of the base.
The length of the altitude is called the height
of the cone. If the altitude meets the base at its center, then the cone is a right cone
. In a right cone, the distance from the vertex to a point on the edge of the base is called the slant height of a cone
If a cone is not a right cone, it is called oblique
. Oblique cones do not have a uniform slant height.